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A target that reported nothing at all is the separate, carried case. The share of the suite's tests the target implements at all. Weighted by test count, not by a count of features." }, "correctness": { "formula": "passed / (passed + failed)", "direction": "higher_is_better", "legacy": true, "description": "The pass rate over implemented operations, which the board led with before schema 3. Retained for consumers that already read it; its denominator shrinks as a target attempts less." }, "grade": { "direction": "A+ is best, F is worst", "gradingVersion": 1, "description": "A reading of the divergence and coverage pair: divergence sets the letter, and one divisor's share of whatever a target leaves unimplemented is added to it before the bands are read, so coverage can only lower a letter. Recompute it from the two values and the criteria below; a criteria change bumps gradingVersion. The letter is weaker than the figures under scope withdrawal - the effective figure falls by (1 - 1/coverageDivisor) of whatever is withdrawn - so rank on divergence and coverage if that matters. Bands read both values rounded to one decimal place; the A+ gate reads them raw. A null on either value means the grade is null ('not scored'): check for it before applying the bands, or a null divergence will coerce and mis-grade.", "bands": [ { "letter": "A", "under": 5 }, { "letter": "B", "under": 15 }, { "letter": "C", "under": 25 }, { "letter": "D", "under": 35 } ], "aPlus": { "divergence": 0, "coverage": 100, "exact": true }, "coverageDivisor": 3, "effective": "2026-08-12" } }, "source": "https://paritysuite.org", "repository": "https://github.com/paritysuite/dynamodb-conformance", "license": "https://creativecommons.org/licenses/by/4.0/", "licenseName": "CC BY 4.0", "attribution": "paritysuite.org", "generatedAt": "2026-09-13T11:39:42.255Z", "baseline": { "slug": "dynamodb", "region": "all", "description": "Live AWS DynamoDB. 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